201
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Choi JH, Gu MJ, Kim MJ, Bae YK, Choi WH, Shin DS, Cho KH. Primary clear cell sarcoma of bone. Skeletal Radiol 2003; 32:598-602. [PMID: 14513295 DOI: 10.1007/s00256-003-0683-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2003] [Revised: 07/14/2003] [Accepted: 07/17/2003] [Indexed: 02/02/2023]
Abstract
Clear cell sarcoma is a rare soft tissue sarcoma of young adults with melanocytic differentiation. It occurs predominantly in the soft tissue of extremities, typically involving tendons and aponeuroses. Primary clear cell sarcoma of bone is extremely rare. We report a case of primary clear cell sarcoma of the right first metatarsal in a 48-year-old woman and provide a literature review of the entity.
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Jee MS, Chang SE, Suh HS, Choi JH, Sung KJ, Moon KC, Koh JK. Porokeratosis ptychotropica associated with dermal amyloid deposits. Clin Exp Dermatol 2003; 28:450-2. [PMID: 12823315 DOI: 10.1046/j.1365-2230.2003.01285_4.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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203
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Choi SM, Lee DG, Kim MS, Park YH, Kim YJ, Lee S, Kim HJ, Choi JH, Yoo JH, Kim DW, Min WS, Shin WS, Kim CC. Bacteremic cellulitis caused by non-O1, non-O139 Vibrio cholerae in a patient following hematopoietic stem cell transplantation. Bone Marrow Transplant 2003; 31:1181-2. [PMID: 12796802 DOI: 10.1038/sj.bmt.1704044] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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204
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Kim KJ, Jee MS, Chang SE, Choi JH, Sung KJ, Moon KC, Koh JK. Kikuchi-Fujimoto disease with papulopustular skin manifestations. Clin Exp Dermatol 2003; 28:142-4. [PMID: 12653698 DOI: 10.1046/j.1365-2230.2003.01160.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Kikuchi-Fujimoto disease commonly presents with cervical lymphadenopathy accompanied by fever, myalgia, neutropaenia, and rarely cutaneous eruption. Most cutaneous lesions present as erythematous macules, papules, plaques, nodules, or ulcers on the upper part of the body such as trunk, upper extremities, and face. We present a case of Kikuchi-Fujimoto disease with a papulopustular eruption on the whole body including the lower extremities.
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Ahn MH, Aoki S, Bhang H, Boyd S, Casper D, Choi JH, Fukuda S, Fukuda Y, Gajewski W, Hara T, Hasegawa M, Hasegawa T, Hayato Y, Hill J, Ichikawa AK, Ikeda A, Inagaki T, Ishida T, Ishii T, Ishitsuka M, Itow Y, Iwashita T, Jang HI, Jang JS, Jeon EJ, Jung CK, Kajita T, Kameda J, Kaneyuki K, Kato I, Kearns E, Kibayashi A, Kielczewska D, Kobayashi K, Kim BJ, Kim CO, Kim JY, Kim SB, Kobayashi T, Kohama M, Koshio Y, Kropp WR, Learned JG, Lim SH, Lim IT, Maesaka H, Martens K, Maruyama T, Matsuno S, Mauger C, McGrew C, Mine S, Miura M, Miyano K, Moriyama S, Nakahata M, Nakamura K, Nakano I, Nakata F, Nakaya T, Nakayama S, Namba T, Nishikawa K, Nishiyama S, Noda S, Obayashi A, Okada A, Ooyabu T, Oyama Y, Pac MY, Park H, Sakuda M, Sakurai N, Sasao N, Scholberg K, Sharkey E, Shiozawa M, So H, Sobel HW, Stachyra A, Stone JL, Suga Y, Sulak LR, Suzuki A, Suzuki Y, Takeuchi Y, Tamura N, Toshito T, Totsuka Y, Vagins MR, Walter CW, Wilkes RJ, Yamada S, Yamamoto S, Yanagisawa C, Yokoyama H, Yoo J, Yoshida M, Zalipska J. Indications of neutrino oscillation in a 250 km long-baseline experiment. PHYSICAL REVIEW LETTERS 2003; 90:041801. [PMID: 12570410 DOI: 10.1103/physrevlett.90.041801] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2002] [Indexed: 05/24/2023]
Abstract
The K2K experiment observes indications of neutrino oscillation: a reduction of nu(mu) flux together with a distortion of the energy spectrum. Fifty-six beam neutrino events are observed in Super-Kamiokande (SK), 250 km from the neutrino production point, with an expectation of 80.1(+6.2)(-5.4). Twenty-nine one ring mu-like events are used to reconstruct the neutrino energy spectrum, which is better matched to the expected spectrum with neutrino oscillation than without. The probability that the observed flux at SK is explained by statistical fluctuation without neutrino oscillation is less than 1%.
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206
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Chang SE, Kim KJ, Lee WS, Choi JH, Sung KJ, Moon KC, Koh JK. A case of Trichosporon cutaneum folliculitis and septicaemia. Clin Exp Dermatol 2003; 28:37-8. [PMID: 12558627 DOI: 10.1046/j.1365-2230.2003.01136.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Trichosporon cutaneum, a saprophytic fungal organism normally found in the soil, has been increasingly recognized as a cause of life-threatening systemic illness in immunosuppressed patients including those with leukaemia. Cutaneous involvement occurs in about 30% of patients with T. cutaneum septicaemia although disseminated folliculitis has not been described to our knowledge. We now describe a case of T. cutaneum follicultis due to fungaemia in a neutropenic patient.
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208
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Kang SK, Chang SE, Choi JH, Sung KJ, Moon KC, Koh JK, Huh JR. Occurrence of angiosarcoma and gastric adenocarcinoma following a cutaneous CD30-positive anaplastic large cell lymphoma. Br J Dermatol 2002; 147:818-20. [PMID: 12366445 DOI: 10.1046/j.1365-2133.2002.49288.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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209
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210
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Cho S, Chang SE, Choi JH, Sung KJ, Moon KC, Koh JK. Myxoid plexiform fibrohistiocytic tumour. J Eur Acad Dermatol Venereol 2002; 16:519-21. [PMID: 12428852 DOI: 10.1046/j.1468-3083.2002.00499.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Plexiform fibrohistiocytic tumour is a low-grade malignant mesenchymal neoplasm of myofibroblastic origin with the capacity for biphasic differentiation toward a fibroblastic or histiocyte-like morphology. We report a case of this rare tumour presenting as a tender subcutaneous nodule on the scalp of a 58-year-old man. Histopathological examination revealed multinodular biphasic proliferation of fibroblast-like and histiocyte-like cells with a few osteoclast-like giant cells. This case is notable for the rare myxoid changes, which may reflect a different behaviour of this tumour when occurring in older people.
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211
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Park W, Kim WH, Lee CH, Kim DY, Choi JH, Huh JW, Sung HM, Kim IS, Kweon OK. Comparison of two fibrin glues in anastomoses and skin closure. JOURNAL OF VETERINARY MEDICINE. A, PHYSIOLOGY, PATHOLOGY, CLINICAL MEDICINE 2002; 49:385-9. [PMID: 12440795 DOI: 10.1046/j.1439-0442.2002.00468.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
To control intra-operative haemorrhage, fibrin glues are preferred by many surgeons because of their biological advantages and convenience of application. Manufacturers have developed a few kinds of fibrin glues with a little difference in their composition. This study was to compare the effectiveness of two commercially available fibrin glues; Greenplast (Green Cross P. D. Company, Yongin, Korea) and Tisseel (Baxter-Immuno AG, Vienna, Austria). They were applied experimentally to several kinds of surgery in dogs - renal vessel anastomosis, partial splenectomy, intestinal anastomosis and incision skin wound - and evaluated for their haemostatic and adhesive effects. When the two glues were applied in renal vessel anastomosis, the amount of haemorrhage in artery and vein decreased significantly. They also decreased the haemorrhage in partial splenectomy. At 10 min after application of the glues to an incision skin wound, the tensile strengths developed were significantly higher than that of control. The present study indicates that two-component fibrin glues have a haemostatic effect as a mechanical barrier in renal vessel anastomosis and an adhesive effect in the early stage of incision skin wound closure, and the two glues have similar effects with no complications.
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212
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Kim KJ, Lee MW, Choi JH, Sung KJ, Moon KC, Koh JK. CD30-positive T-cell-rich pseudolymphoma induced by gold acupuncture. Br J Dermatol 2002; 146:882-4. [PMID: 12000389 DOI: 10.1046/j.1365-2133.2002.04649.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Cases of pseudolymphoma induced by intradermal gold injection or gold piercing have previously been described. Most of these cases showed the histopathological finding of B-lymphocyte predominant lymphocytoma cutis. We describe a patient with gold acupuncture-induced T-cell-rich pseudolymphoma. Some T cells showed positive staining with CD30. The lesions responded to an intralesional injection of triamcinolone acetonide.
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Abstract
Ota's naevus is among the dermal melanocytoses that show a distinct pattern involving skin innervated by the trigeminal nerve. Most cases present at birth or manifest clinically in early childhood. Cases of acquired lesions in adult onset have been reported rarely. We present two cases of late onset Ota's naevus which were confirmed by skin biopsies. Both patients underwent Q-switched alexandrite laser treatment with a dose of 8.0 J/cm2 given four or five times at 6 weekly intervals and showed some improvement.
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214
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Kang SK, Chang SE, Choi JH, Sung KJ, Moon KC, Koh JK. Coexistence of CD30-positive anaplastic large cell lymphoma and mycosis fungoides. Clin Exp Dermatol 2002; 27:212-5. [PMID: 12072011 DOI: 10.1046/j.1365-2230.2002.01023.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Primary cutaneous T-cell lymphomas, including lymphomatoid papulosis, mycosis fungoides and CD30+ anaplastic large cell lymphoma (ALCL) overlap clinicopathologically and form part of a spectrum of lymphoproliferative disorders. There have been several case reports of these diseases coexisting. We describe a 59-year-old Korean man who presented with a recurrent, solitary CD30+ ALCL of 25 years' duration as well as patch stage mycosis fungoides of 11 years' duration. Such occurrences may represent different clinical manifestations of the same clonal T-cell abnormality, and provide further insight into the pathogenesis of these related disorders.
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215
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Chang SE, Koh GJ, Choi JH, Lee KH, Sung KJ, Moon KC, Koh JK. Widespread skin-limited adult Langerhans cell histiocytosis: long-term follow-up with good response to interferon alpha. Clin Exp Dermatol 2002; 27:135-7. [PMID: 11952707 DOI: 10.1046/j.1365-2230.2002.00989.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Langerhans cell histiocytosis (LCH) most frequently involves bone, but also involves the skin in 40% of cases; in 10% of patients it is limited to the skin. Cutaneous findings of skin-limited LCH are scaly papules, vesicles, nodules, tumours with erosion, ulceration, or crusting and/or purpura. We report a case of widespread adult-onset LCH confined to skin in which topical carmustine, photochemotherapy, systemic steroids, and 2-chlorodeoxyadenosine were only partially effective. However, longer remission was achieved by the use of subcutaneous interferon-alpha2b.
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216
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Chang SE, Lee SY, Choi JH, Sung KJ, Moon KC, Koh JK. Cutaneous dissemination of nasal NK/T-cell lymphoma with bone marrow, liver and lung involvement. Clin Exp Dermatol 2002; 27:120-2. [PMID: 11952703 DOI: 10.1046/j.1365-2230.2002.00991.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We describe a 32-year-old Korean man with a primary nasal natural killer (NK)/T-cell lymphoma (NKTCL). Combination chemotherapy and radiotherapy resulted in initial complete remission. However, cutaneous dissemination to the trunk and proximal extremities occurred 16 months later and further investigations revealed involvement of the liver, lymph nodes, lung and bone marrow. Nasal CD56+ NKTCL is mostly localized to the nasal area but also shows a predilection for other sites, such as skin. Cutaneous dissemination may be an indicator of widespread metastasis to internal organs and is consistently fatal.
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217
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Kim KJ, Chang SE, Choi JH, Sung KJ, Moon KC, Koh JK. Periungal hyperpigmentation induced by cisplatin. Clin Exp Dermatol 2002; 27:118-9. [PMID: 11952702 DOI: 10.1046/j.1365-2230.2002.00972.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
A number of anticancer drugs are known to produce pigmentary changes affecting the skin or nails. Among them, cisplatin (cis-diamminedichloroplatinum)-induced hyperpigmentation has been described previously in only two cases. We describe an unusual case with hyperpigmentation confined to periungal areas of the hands and feet after treatment with cisplatin.
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218
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Lee JK, Park JS, Choi JH, Park BK, Lee BC, Hwang WS, Kim JH, Jean YH, Haritani M, Yoo HS, Kim DY. Encephalomyelitis associated with akabane virus infection in adult cows. Vet Pathol 2002; 39:269-73. [PMID: 12009066 DOI: 10.1354/vp.39-2-269] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Between August and September 2000, five 2-7-year-old cows in Korea exhibited neurologic signs and were diagnosed as infected with Akabane virus based on the results of histopathology, immunohistochemistry, serology, and reverse transcription polymerase chain reaction (RT-PCR) analysis. Immunohistochemistry and RT-PCR were equally effective and sensitive for diagnosing Akabane virus infection during the early stage of infection. Typical lymphohistiocytic inflammation characterized by perivascular mononuclear cell infiltration, gliosis, neuronophagia, and neuronal loss was noted in the brain and the ventral horn gray matter of the spinal cord. The lesions in the brain were most prominent in the pons and medulla oblongata. Akabane virus antigen was detected in the brain and spinal cord, mainly in degenerating neurons and glial cells. RT-PCR analysis revealed a target band of expected size in four cows. This is the first report on an outbreak of natural Akabane virus infection in adult cattle.
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219
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Choi JY, Choi JH, Kim NK, Kim Y, Lee JK, Kim MK, Lee JH, Kim MJ. Analysis of errors in medical rapid prototyping models. Int J Oral Maxillofac Surg 2002; 31:23-32. [PMID: 11936396 DOI: 10.1054/ijom.2000.0135] [Citation(s) in RCA: 216] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Rapid prototyping (RP) is a relatively new technology that produces physical models by selectively solidifying UV-sensitive liquid resin using a laser beam. The technology has gained a great amount of attention, particularly in oral and maxillofacial surgery. An important issue in RP applications in this field is how to obtain RP models of the required accuracy. We investigated errors generated during the production of medical RP models, and identified the factors that caused dimensional errors in each production phase. The errors were mainly due to the volume-averaging effect, threshold value, and difficulty in the exact replication of landmark locations. We made 16 linear measurements on a dry skull, a replicated three-dimensional (3-D) visual (STL) model, and an RP model. The results showed that the absolute mean deviation between the original dry skull and the RP model over the 16 linear measurements was 0.62 +/- 0.35 mm (0.56 +/- 0.39%), which is smaller than values reported in previous studies. A major emphasis is placed on the dumb-bell effect. Classifying measurements as internal and external measurements, we observed that the effect of an inadequate threshold value differs with the type of measurement.
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Abstract
Ectopic thyroid is an uncommon embryological aberration characterized by the presence of thyroid tissue in a site other than in its usual pre-tracheal region. It occurs along the path of descent of the developing thyroid primodium from the foramen cecum. It most commonly presents itself as a lingual thyroid and is the only thyroid in 70% of all cases. It is extremely rare for two ectopic foci of thyroid tissue to be present simultaneously. The authors report a recent case of dual ectopic thyroid present in the lingual and infrahyoid areas with no thyroid tissue in the pre-tracheal area in a 15-year-old girl. The patient had originally been scheduled for surgery under the impression of thyroglossal duct cyst; however, a pre-operative computed tomography scan of neck and thyroid scans revealed the presence of dual ectopic thyroid, thus preventing unnecessary surgery. Therefore, thyroid scan, along with either neck CT or neck ultrasonogram, should be performed routinely to avoid unnecessary surgery if the clinical picture is at all compatible with thyroid ectopia.
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Abstract
Suppurative bronchopneumonia was discovered in a 6-yr-old male jaguar (Panthera onca onca) that died after a 1 wk history of anorexia, depression, and respiratory difficulty. Morganella morganii was isolated as a pure culture from the lung, spleen, and heart blood. This is the first record of M. morganii induced pneumonia in a jaguar.
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222
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Jung MJ, Choi JH, Chung HY, Jung JH, Choi JS. A new C-methylated flavonoid glycoside from Pinus densiflora. Fitoterapia 2001; 72:943-5. [PMID: 11731124 DOI: 10.1016/s0367-326x(01)00337-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new C-methyl flavonol glycoside, 5,7,8,4'-tetrahydroxy-3-methoxy-6-methylflavone 8-O-beta-D-glucopyranoside (1), has been isolated from the needles of Pinus densiflora, together with kaempferol 3-O-beta-(6"-acetyl)-galactopyranoside.
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223
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Kwon OS, Lee HS, Koh DW, Cho YJ, Park YH, Park DK, Oh YL, Seo JH, Chun HJ, Um SH, Lee SW, Choi JH, Kim CD, Ryu HS, Hyun JH, Kim AR, Kim YS. A case of primary adenosquamous carcinoma of the liver presented with liver abscess. Korean J Intern Med 2001; 16:270-3. [PMID: 11855159 PMCID: PMC4578056 DOI: 10.3904/kjim.2001.16.4.270] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
Primary adenosquamous carcinoma of the liver is a very rare type of cholangiocarcinoma and is defined as a cancer containing both squamous and adenomatous components in the same lesion. Recently, we experienced a primary adenosquamous carcinoma of the liver presented as liver abscess. A 63-year-old man was presented with a 4-day history of fever and chill. The radiologic study showed a 4 cm-sized, central hypoattenuated mass with peripheral rim enhancement in the left lobe of the liver. Ultrasonography-guided aspiration and biopsy suggested an adenocarcinoma with abscess in the liver. At laparotomy, the tumor occupied the left lobe of the liver and invaded the right diaphragm. An extended left lobectomy and a partial excision of the involved diaphragm were done. Grossly, the tumor was 6 x 5 x 5 cm in size and had an eccentric necrosis. Microscopically, the tumor was composed of adenocarcinoma and squamous cell carcinoma with a transitional area.
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224
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Choi JH, Kwon HJ, Yoon BI, Kim JH, Han SU, Joo HJ, Kim DY. Expression profile of histone deacetylase 1 in gastric cancer tissues. Jpn J Cancer Res 2001; 92:1300-4. [PMID: 11749695 PMCID: PMC5926683 DOI: 10.1111/j.1349-7006.2001.tb02153.x] [Citation(s) in RCA: 259] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Although histone deacetylases (HDACs) appear to play a crucial role in carcinogenesis, the expression status of HDACs in primary human cancer tissues has not yet been reported. In this study, we investigated the expression level of HDAC1 in 25 paired primary human gastric cancer (GC) tissues and corresponding normal tissues through semi-quantitative RT-PCR and immunoblot analysis. The HDAC1 expression pattern was also topologically examined through immunohistochemistry. Overexpression of HDAC1 mRNA was detected in 68% of GC tissues (17 of 25), and the relative density of HDAC1 mRNA in GC tissue was increased 1.8-fold versus the normal counterpart (P < 0.01). Elevated expression of HDAC1 protein was also detected in 61% of GC samples (11 of 18), which also showed an increased mRNA level of HDAC. Immunohistochemically, overexpression of HDAC1 was predominantly localized in the nuclei of most neoplastic cells, including embolic tumor cells, whereas normal glandular epithelial cells revealed only weak HDAC1 expression that was focal in distribution. Thus, the present study clearly demonstrates that HDAC1 is overexpressed in GC and probably plays a significant role in gastric carcinogenesis.
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225
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Choi BK, Kim KY, Yoo YJ, Oh SJ, Choi JH, Kim CY. In vitro antimicrobial activity of a chitooligosaccharide mixture against Actinobacillus actinomycetemcomitans and Streptococcus mutans. Int J Antimicrob Agents 2001; 18:553-7. [PMID: 11738343 DOI: 10.1016/s0924-8579(01)00434-4] [Citation(s) in RCA: 243] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The purpose of this study was to evaluate the in vitro antibacterial activity of a chitooligosaccharide mixture (MW 2000-30000 Da) with a deacetylation degree of 91.5% against two representative oral pathogens, Actinobacillus actinomycetemcomitans and Streptococcus mutans. A 0.1% concentration of the chitooligosaccharides (derived from the exoskeletons of marine crustaceans) was used to estimate antibacterial activity. Approximately 2 logcolony forming units (CFU)/ml of A. actinomycetemcomitans were inactivated by 0.1% chitosan after 30 min, while 120 min exposure inactivated about 4.5 logCFU/ml of this organism. In contrast, the level of inactivation against S. mutans was less than 0.5 logCFU/ml after an exposure of up to 120 min. Electron microscopy showed that the exposure of A. actinomycetemcomitans to the chitooligosaccharides resulted in the disruption of cell membranes and that it could be considered for the treatment of periodontal diseases associated with A. actinomycetemcomitans.
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